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Discusses exchange of photographs with Édouard Claparède, "for whom I feel the highest respect".
Has been looking at separation of sexes in poplars.
Interested in reversion.
Does not understand all CD said on inheritance.
JDH now remembers that Origin was "published" some time before it was "distributed" and therefore appeared prior to his own essay [see also 2478].
Impossible to say whether some Dipterocarpaceae survived a cold period or have developed since.